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Finding the Fourth Proportional to 665,574.27, 918,607.89 and 643,430.89

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Solution

The fourth proportional to 665,574.27, 918,607.89 and 643,430.89 is: 888,046.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,574.27 : 918,607.89 = 643,430.89 : x
  2. Step 2: Convert to fraction form
    665,574.27/918,607.89 = 643,430.89/x
  3. Step 3: Cross multiply
    665,574.27x = 918,607.89 × 643,430.89
  4. Step 4: Simplify right side
    665,574.27x = 591,060,692,165.55
  5. Step 5: Solve for x
    x = 591,060,692,165.55/665,574.27
  6. Step 6: Final answer
    x = 888,046.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.