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Finding the Fourth Proportional to 931.40, 1,397.10 and 585.80

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Solution

The fourth proportional to 931.40, 1,397.10 and 585.80 is: 878.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.40 : 1,397.10 = 585.80 : x
  2. Step 2: Convert to fraction form
    931.40/1,397.10 = 585.80/x
  3. Step 3: Cross multiply
    931.40x = 1,397.10 × 585.80
  4. Step 4: Simplify right side
    931.40x = 818,421.18
  5. Step 5: Solve for x
    x = 818,421.18/931.40
  6. Step 6: Final answer
    x = 878.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.