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Finding the Fourth Proportional to 390,771.72, 586,151.18 and 124,528.68

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Solution

The fourth proportional to 390,771.72, 586,151.18 and 124,528.68 is: 186,790.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,771.72 : 586,151.18 = 124,528.68 : x
  2. Step 2: Convert to fraction form
    390,771.72/586,151.18 = 124,528.68/x
  3. Step 3: Cross multiply
    390,771.72x = 586,151.18 × 124,528.68
  4. Step 4: Simplify right side
    390,771.72x = 72,992,632,725.84
  5. Step 5: Solve for x
    x = 72,992,632,725.84/390,771.72
  6. Step 6: Final answer
    x = 186,790.98

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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.