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Finding the Fourth Proportional to 72,706.88, 100,332.86 and 40,878.76

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Solution

The fourth proportional to 72,706.88, 100,332.86 and 40,878.76 is: 56,411.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,706.88 : 100,332.86 = 40,878.76 : x
  2. Step 2: Convert to fraction form
    72,706.88/100,332.86 = 40,878.76/x
  3. Step 3: Cross multiply
    72,706.88x = 100,332.86 × 40,878.76
  4. Step 4: Simplify right side
    72,706.88x = 4,101,482,904.05
  5. Step 5: Solve for x
    x = 4,101,482,904.05/72,706.88
  6. Step 6: Final answer
    x = 56,411.21

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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.