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Finding the Fourth Proportional to 1,089.70, 1,504.10 and 647.77

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Solution

The fourth proportional to 1,089.70, 1,504.10 and 647.77 is: 894.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.70 : 1,504.10 = 647.77 : x
  2. Step 2: Convert to fraction form
    1,089.70/1,504.10 = 647.77/x
  3. Step 3: Cross multiply
    1,089.70x = 1,504.10 × 647.77
  4. Step 4: Simplify right side
    1,089.70x = 974,310.86
  5. Step 5: Solve for x
    x = 974,310.86/1,089.70
  6. Step 6: Final answer
    x = 894.11

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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.