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Finding the Fourth Proportional to 1,008.95, 1,510.30 and 861.35

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Solution

The fourth proportional to 1,008.95, 1,510.30 and 861.35 is: 1,289.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.95 : 1,510.30 = 861.35 : x
  2. Step 2: Convert to fraction form
    1,008.95/1,510.30 = 861.35/x
  3. Step 3: Cross multiply
    1,008.95x = 1,510.30 × 861.35
  4. Step 4: Simplify right side
    1,008.95x = 1,300,887.20
  5. Step 5: Solve for x
    x = 1,300,887.20/1,008.95
  6. Step 6: Final answer
    x = 1,289.35

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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.