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Finding the Fourth Proportional to 1,407.40, 2,113.22 and 861.86

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Solution

The fourth proportional to 1,407.40, 2,113.22 and 861.86 is: 1,294.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.40 : 2,113.22 = 861.86 : x
  2. Step 2: Convert to fraction form
    1,407.40/2,113.22 = 861.86/x
  3. Step 3: Cross multiply
    1,407.40x = 2,113.22 × 861.86
  4. Step 4: Simplify right side
    1,407.40x = 1,821,307.23
  5. Step 5: Solve for x
    x = 1,821,307.23/1,407.40
  6. Step 6: Final answer
    x = 1,294.10

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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.