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Finding the Fourth Proportional to 1,089.43, 1,503.90 and 647.47

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Solution

The fourth proportional to 1,089.43, 1,503.90 and 647.47 is: 893.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.43 : 1,503.90 = 647.47 : x
  2. Step 2: Convert to fraction form
    1,089.43/1,503.90 = 647.47/x
  3. Step 3: Cross multiply
    1,089.43x = 1,503.90 × 647.47
  4. Step 4: Simplify right side
    1,089.43x = 973,730.13
  5. Step 5: Solve for x
    x = 973,730.13/1,089.43
  6. Step 6: Final answer
    x = 893.80

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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.