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Finding the Fourth Proportional to 91,158.66, 136,737.18 and 31,980.47

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Solution

The fourth proportional to 91,158.66, 136,737.18 and 31,980.47 is: 47,970.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,158.66 : 136,737.18 = 31,980.47 : x
  2. Step 2: Convert to fraction form
    91,158.66/136,737.18 = 31,980.47/x
  3. Step 3: Cross multiply
    91,158.66x = 136,737.18 × 31,980.47
  4. Step 4: Simplify right side
    91,158.66x = 4,372,918,599.19
  5. Step 5: Solve for x
    x = 4,372,918,599.19/91,158.66
  6. Step 6: Final answer
    x = 47,970.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.