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Finding the Fourth Proportional to 1,001.55, 1,381.65 and 647.37

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Solution

The fourth proportional to 1,001.55, 1,381.65 and 647.37 is: 893.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.55 : 1,381.65 = 647.37 : x
  2. Step 2: Convert to fraction form
    1,001.55/1,381.65 = 647.37/x
  3. Step 3: Cross multiply
    1,001.55x = 1,381.65 × 647.37
  4. Step 4: Simplify right side
    1,001.55x = 894,438.76
  5. Step 5: Solve for x
    x = 894,438.76/1,001.55
  6. Step 6: Final answer
    x = 893.05

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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.