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Finding the Fourth Proportional to 918,020, 1,266,986.40 and 515,612

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Solution

The fourth proportional to 918,020, 1,266,986.40 and 515,612 is: 711,611.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    918,020 : 1,266,986.40 = 515,612 : x
  2. Step 2: Convert to fraction form
    918,020/1,266,986.40 = 515,612/x
  3. Step 3: Cross multiply
    918,020x = 1,266,986.40 × 515,612
  4. Step 4: Simplify right side
    918,020x = 653,273,391,676.80
  5. Step 5: Solve for x
    x = 653,273,391,676.80/918,020
  6. Step 6: Final answer
    x = 711,611.28

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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.