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Finding the Fourth Proportional to 692,915, 956,222.76 and 391,128.44

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Solution

The fourth proportional to 692,915, 956,222.76 and 391,128.44 is: 539,757.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    692,915 : 956,222.76 = 391,128.44 : x
  2. Step 2: Convert to fraction form
    692,915/956,222.76 = 391,128.44/x
  3. Step 3: Cross multiply
    692,915x = 956,222.76 × 391,128.44
  4. Step 4: Simplify right side
    692,915x = 374,005,916,411.29
  5. Step 5: Solve for x
    x = 374,005,916,411.29/692,915
  6. Step 6: Final answer
    x = 539,757.28

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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.