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Finding the Fourth Proportional to 1,506.76, 2,079.12 and 917.20

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Solution

The fourth proportional to 1,506.76, 2,079.12 and 917.20 is: 1,265.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,506.76 : 2,079.12 = 917.20 : x
  2. Step 2: Convert to fraction form
    1,506.76/2,079.12 = 917.20/x
  3. Step 3: Cross multiply
    1,506.76x = 2,079.12 × 917.20
  4. Step 4: Simplify right side
    1,506.76x = 1,906,968.86
  5. Step 5: Solve for x
    x = 1,906,968.86/1,506.76
  6. Step 6: Final answer
    x = 1,265.61

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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.