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Finding the Fourth Proportional to 509,045.80, 763,568.70 and 391,311.40

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Solution

The fourth proportional to 509,045.80, 763,568.70 and 391,311.40 is: 586,967.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    509,045.80 : 763,568.70 = 391,311.40 : x
  2. Step 2: Convert to fraction form
    509,045.80/763,568.70 = 391,311.40/x
  3. Step 3: Cross multiply
    509,045.80x = 763,568.70 × 391,311.40
  4. Step 4: Simplify right side
    509,045.80x = 298,793,136,993.18
  5. Step 5: Solve for x
    x = 298,793,136,993.18/509,045.80
  6. Step 6: Final answer
    x = 586,967.10

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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.