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Finding the Fourth Proportional to 587,211.40, 880,817.10 and 390,219.40

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Solution

The fourth proportional to 587,211.40, 880,817.10 and 390,219.40 is: 585,329.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    587,211.40 : 880,817.10 = 390,219.40 : x
  2. Step 2: Convert to fraction form
    587,211.40/880,817.10 = 390,219.40/x
  3. Step 3: Cross multiply
    587,211.40x = 880,817.10 × 390,219.40
  4. Step 4: Simplify right side
    587,211.40x = 343,711,920,271.74
  5. Step 5: Solve for x
    x = 343,711,920,271.74/587,211.40
  6. Step 6: Final answer
    x = 585,329.10

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.