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Finding the Fourth Proportional to 1,085.28, 1,497.95 and 686.93

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Solution

The fourth proportional to 1,085.28, 1,497.95 and 686.93 is: 948.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.28 : 1,497.95 = 686.93 : x
  2. Step 2: Convert to fraction form
    1,085.28/1,497.95 = 686.93/x
  3. Step 3: Cross multiply
    1,085.28x = 1,497.95 × 686.93
  4. Step 4: Simplify right side
    1,085.28x = 1,028,975.87
  5. Step 5: Solve for x
    x = 1,028,975.87/1,085.28
  6. Step 6: Final answer
    x = 948.12

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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.