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Finding the Fourth Proportional to 390,748.74, 586,116.70 and 124,505.65

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Solution

The fourth proportional to 390,748.74, 586,116.70 and 124,505.65 is: 186,756.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,748.74 : 586,116.70 = 124,505.65 : x
  2. Step 2: Convert to fraction form
    390,748.74/586,116.70 = 124,505.65/x
  3. Step 3: Cross multiply
    390,748.74x = 586,116.70 × 124,505.65
  4. Step 4: Simplify right side
    390,748.74x = 72,974,840,709.36
  5. Step 5: Solve for x
    x = 72,974,840,709.36/390,748.74
  6. Step 6: Final answer
    x = 186,756.43

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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.