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Finding the Fourth Proportional to 1,302.90, 1,798.49 and 861.40

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Solution

The fourth proportional to 1,302.90, 1,798.49 and 861.40 is: 1,189.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,302.90 : 1,798.49 = 861.40 : x
  2. Step 2: Convert to fraction form
    1,302.90/1,798.49 = 861.40/x
  3. Step 3: Cross multiply
    1,302.90x = 1,798.49 × 861.40
  4. Step 4: Simplify right side
    1,302.90x = 1,549,223.69
  5. Step 5: Solve for x
    x = 1,549,223.69/1,302.90
  6. Step 6: Final answer
    x = 1,189.06

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1.5x scale

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.