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Finding the Fourth Proportional to 390,999.69, 586,489.28 and 124,776.45

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Solution

The fourth proportional to 390,999.69, 586,489.28 and 124,776.45 is: 187,161.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,999.69 : 586,489.28 = 124,776.45 : x
  2. Step 2: Convert to fraction form
    390,999.69/586,489.28 = 124,776.45/x
  3. Step 3: Cross multiply
    390,999.69x = 586,489.28 × 124,776.45
  4. Step 4: Simplify right side
    390,999.69x = 73,180,049,697.57
  5. Step 5: Solve for x
    x = 73,180,049,697.57/390,999.69
  6. Step 6: Final answer
    x = 187,161.40

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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.