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Finding the Fourth Proportional to 675,938, 932,795.28 and 421,289

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Solution

The fourth proportional to 675,938, 932,795.28 and 421,289 is: 581,379.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    675,938 : 932,795.28 = 421,289 : x
  2. Step 2: Convert to fraction form
    675,938/932,795.28 = 421,289/x
  3. Step 3: Cross multiply
    675,938x = 932,795.28 × 421,289
  4. Step 4: Simplify right side
    675,938x = 392,976,390,715.92
  5. Step 5: Solve for x
    x = 392,976,390,715.92/675,938
  6. Step 6: Final answer
    x = 581,379.34

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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.