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Finding the Fourth Proportional to 1,312.40, 1,969.50 and 874.16

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Solution

The fourth proportional to 1,312.40, 1,969.50 and 874.16 is: 1,311.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.40 : 1,969.50 = 874.16 : x
  2. Step 2: Convert to fraction form
    1,312.40/1,969.50 = 874.16/x
  3. Step 3: Cross multiply
    1,312.40x = 1,969.50 × 874.16
  4. Step 4: Simplify right side
    1,312.40x = 1,721,658.12
  5. Step 5: Solve for x
    x = 1,721,658.12/1,312.40
  6. Step 6: Final answer
    x = 1,311.84

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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.