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Finding the Fourth Proportional to 648,734.40, 972,955.80 and 425,660.40

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Solution

The fourth proportional to 648,734.40, 972,955.80 and 425,660.40 is: 638,394.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    648,734.40 : 972,955.80 = 425,660.40 : x
  2. Step 2: Convert to fraction form
    648,734.40/972,955.80 = 425,660.40/x
  3. Step 3: Cross multiply
    648,734.40x = 972,955.80 × 425,660.40
  4. Step 4: Simplify right side
    648,734.40x = 414,148,755,010.32
  5. Step 5: Solve for x
    x = 414,148,755,010.32/648,734.40
  6. Step 6: Final answer
    x = 638,394.93

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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.