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Finding the Fourth Proportional to 518,864.60, 778,296.90 and 430,291.10

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Solution

The fourth proportional to 518,864.60, 778,296.90 and 430,291.10 is: 645,436.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,864.60 : 778,296.90 = 430,291.10 : x
  2. Step 2: Convert to fraction form
    518,864.60/778,296.90 = 430,291.10/x
  3. Step 3: Cross multiply
    518,864.60x = 778,296.90 × 430,291.10
  4. Step 4: Simplify right side
    518,864.60x = 334,894,229,227.59
  5. Step 5: Solve for x
    x = 334,894,229,227.59/518,864.60
  6. Step 6: Final answer
    x = 645,436.65

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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.