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Finding the Fourth Proportional to 715.64, 988.40 and 520.02

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Solution

The fourth proportional to 715.64, 988.40 and 520.02 is: 718.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.64 : 988.40 = 520.02 : x
  2. Step 2: Convert to fraction form
    715.64/988.40 = 520.02/x
  3. Step 3: Cross multiply
    715.64x = 988.40 × 520.02
  4. Step 4: Simplify right side
    715.64x = 513,989.07
  5. Step 5: Solve for x
    x = 513,989.07/715.64
  6. Step 6: Final answer
    x = 718.23

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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.