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Finding the Fourth Proportional to 387,689.06, 535,001.28 and 217,934.12

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Solution

The fourth proportional to 387,689.06, 535,001.28 and 217,934.12 is: 300,743.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,689.06 : 535,001.28 = 217,934.12 : x
  2. Step 2: Convert to fraction form
    387,689.06/535,001.28 = 217,934.12/x
  3. Step 3: Cross multiply
    387,689.06x = 535,001.28 × 217,934.12
  4. Step 4: Simplify right side
    387,689.06x = 116,595,033,155.67
  5. Step 5: Solve for x
    x = 116,595,033,155.67/387,689.06
  6. Step 6: Final answer
    x = 300,743.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.