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Finding the Fourth Proportional to 100,925.84, 139,283.88 and 56,213.84

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Solution

The fourth proportional to 100,925.84, 139,283.88 and 56,213.84 is: 77,578.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,925.84 : 139,283.88 = 56,213.84 : x
  2. Step 2: Convert to fraction form
    100,925.84/139,283.88 = 56,213.84/x
  3. Step 3: Cross multiply
    100,925.84x = 139,283.88 × 56,213.84
  4. Step 4: Simplify right side
    100,925.84x = 7,829,681,744.90
  5. Step 5: Solve for x
    x = 7,829,681,744.90/100,925.84
  6. Step 6: Final answer
    x = 77,578.56

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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.