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Finding the Fourth Proportional to 954.90, 1,430.19 and 931.68

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Solution

The fourth proportional to 954.90, 1,430.19 and 931.68 is: 1,395.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.90 : 1,430.19 = 931.68 : x
  2. Step 2: Convert to fraction form
    954.90/1,430.19 = 931.68/x
  3. Step 3: Cross multiply
    954.90x = 1,430.19 × 931.68
  4. Step 4: Simplify right side
    954.90x = 1,332,479.42
  5. Step 5: Solve for x
    x = 1,332,479.42/954.90
  6. Step 6: Final answer
    x = 1,395.41

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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.