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Finding the Fourth Proportional to 1,000.72, 1,501.80 and 611.08

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Solution

The fourth proportional to 1,000.72, 1,501.80 and 611.08 is: 917.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.72 : 1,501.80 = 611.08 : x
  2. Step 2: Convert to fraction form
    1,000.72/1,501.80 = 611.08/x
  3. Step 3: Cross multiply
    1,000.72x = 1,501.80 × 611.08
  4. Step 4: Simplify right side
    1,000.72x = 917,719.94
  5. Step 5: Solve for x
    x = 917,719.94/1,000.72
  6. Step 6: Final answer
    x = 917.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.