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Finding the Fourth Proportional to 579,812.40, 869,718.60 and 390,855.60

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Solution

The fourth proportional to 579,812.40, 869,718.60 and 390,855.60 is: 586,283.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,812.40 : 869,718.60 = 390,855.60 : x
  2. Step 2: Convert to fraction form
    579,812.40/869,718.60 = 390,855.60/x
  3. Step 3: Cross multiply
    579,812.40x = 869,718.60 × 390,855.60
  4. Step 4: Simplify right side
    579,812.40x = 339,934,385,234.16
  5. Step 5: Solve for x
    x = 339,934,385,234.16/579,812.40
  6. Step 6: Final answer
    x = 586,283.40

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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.