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Finding the Fourth Proportional to 1,312.94, 1,812.04 and 781.85

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Solution

The fourth proportional to 1,312.94, 1,812.04 and 781.85 is: 1,079.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.94 : 1,812.04 = 781.85 : x
  2. Step 2: Convert to fraction form
    1,312.94/1,812.04 = 781.85/x
  3. Step 3: Cross multiply
    1,312.94x = 1,812.04 × 781.85
  4. Step 4: Simplify right side
    1,312.94x = 1,416,746.05
  5. Step 5: Solve for x
    x = 1,416,746.05/1,312.94
  6. Step 6: Final answer
    x = 1,079.06

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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.