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Finding the Fourth Proportional to 99,931, 137,912.66 and 56,912.32

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Solution

The fourth proportional to 99,931, 137,912.66 and 56,912.32 is: 78,543.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,931 : 137,912.66 = 56,912.32 : x
  2. Step 2: Convert to fraction form
    99,931/137,912.66 = 56,912.32/x
  3. Step 3: Cross multiply
    99,931x = 137,912.66 × 56,912.32
  4. Step 4: Simplify right side
    99,931x = 7,848,929,437.97
  5. Step 5: Solve for x
    x = 7,848,929,437.97/99,931
  6. Step 6: Final answer
    x = 78,543.49

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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.