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Finding the Fourth Proportional to 91,384.65, 136,925.10 and 87,929.19

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Solution

The fourth proportional to 91,384.65, 136,925.10 and 87,929.19 is: 131,747.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,384.65 : 136,925.10 = 87,929.19 : x
  2. Step 2: Convert to fraction form
    91,384.65/136,925.10 = 87,929.19/x
  3. Step 3: Cross multiply
    91,384.65x = 136,925.10 × 87,929.19
  4. Step 4: Simplify right side
    91,384.65x = 12,039,713,133.67
  5. Step 5: Solve for x
    x = 12,039,713,133.67/91,384.65
  6. Step 6: Final answer
    x = 131,747.65

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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.