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Finding the Fourth Proportional to 1,117.02, 1,541.56 and 645.00

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Solution

The fourth proportional to 1,117.02, 1,541.56 and 645.00 is: 890.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.02 : 1,541.56 = 645.00 : x
  2. Step 2: Convert to fraction form
    1,117.02/1,541.56 = 645.00/x
  3. Step 3: Cross multiply
    1,117.02x = 1,541.56 × 645.00
  4. Step 4: Simplify right side
    1,117.02x = 994,311.62
  5. Step 5: Solve for x
    x = 994,311.62/1,117.02
  6. Step 6: Final answer
    x = 890.15

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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.