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Finding the Fourth Proportional to 390,999.94, 586,489.65 and 124,776.70

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Solution

The fourth proportional to 390,999.94, 586,489.65 and 124,776.70 is: 187,161.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,999.94 : 586,489.65 = 124,776.70 : x
  2. Step 2: Convert to fraction form
    390,999.94/586,489.65 = 124,776.70/x
  3. Step 3: Cross multiply
    390,999.94x = 586,489.65 × 124,776.70
  4. Step 4: Simplify right side
    390,999.94x = 73,180,243,111.16
  5. Step 5: Solve for x
    x = 73,180,243,111.16/390,999.94
  6. Step 6: Final answer
    x = 187,161.78

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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.