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Finding the Fourth Proportional to 715.02, 983.78 and 621.52

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Solution

The fourth proportional to 715.02, 983.78 and 621.52 is: 855.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.02 : 983.78 = 621.52 : x
  2. Step 2: Convert to fraction form
    715.02/983.78 = 621.52/x
  3. Step 3: Cross multiply
    715.02x = 983.78 × 621.52
  4. Step 4: Simplify right side
    715.02x = 611,438.95
  5. Step 5: Solve for x
    x = 611,438.95/715.02
  6. Step 6: Final answer
    x = 855.14

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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.