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Finding the Fourth Proportional to 638,117.70, 957,176.55 and 319,253.10

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Solution

The fourth proportional to 638,117.70, 957,176.55 and 319,253.10 is: 478,879.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,117.70 : 957,176.55 = 319,253.10 : x
  2. Step 2: Convert to fraction form
    638,117.70/957,176.55 = 319,253.10/x
  3. Step 3: Cross multiply
    638,117.70x = 957,176.55 × 319,253.10
  4. Step 4: Simplify right side
    638,117.70x = 305,581,580,834.81
  5. Step 5: Solve for x
    x = 305,581,580,834.81/638,117.70
  6. Step 6: Final answer
    x = 478,879.65

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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.