Home / 641,502,005.42-885,144,721.74-390,438,235.10

Finding the Fourth Proportional to 641,502,005.42, 885,144,721.74 and 390,438,235.10

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Solution

The fourth proportional to 641,502,005.42, 885,144,721.74 and 390,438,235.10 is: 538,726,831.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,502,005.42 : 885,144,721.74 = 390,438,235.10 : x
  2. Step 2: Convert to fraction form
    641,502,005.42/885,144,721.74 = 390,438,235.10/x
  3. Step 3: Cross multiply
    641,502,005.42x = 885,144,721.74 × 390,438,235.10
  4. Step 4: Simplify right side
    641,502,005.42x = 345,594,342,964,246,208
  5. Step 5: Solve for x
    x = 345,594,342,964,246,208/641,502,005.42
  6. Step 6: Final answer
    x = 538,726,831.79

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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.