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Finding the Fourth Proportional to 659,386.61, 988,999.72 and 280,459.70

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Solution

The fourth proportional to 659,386.61, 988,999.72 and 280,459.70 is: 420,655.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,386.61 : 988,999.72 = 280,459.70 : x
  2. Step 2: Convert to fraction form
    659,386.61/988,999.72 = 280,459.70/x
  3. Step 3: Cross multiply
    659,386.61x = 988,999.72 × 280,459.70
  4. Step 4: Simplify right side
    659,386.61x = 277,374,562,833.89
  5. Step 5: Solve for x
    x = 277,374,562,833.89/659,386.61
  6. Step 6: Final answer
    x = 420,655.44

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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.