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Finding the Fourth Proportional to 970, 1,455.20 and 392.88

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Solution

The fourth proportional to 970, 1,455.20 and 392.88 is: 589.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    970 : 1,455.20 = 392.88 : x
  2. Step 2: Convert to fraction form
    970/1,455.20 = 392.88/x
  3. Step 3: Cross multiply
    970x = 1,455.20 × 392.88
  4. Step 4: Simplify right side
    970x = 571,718.98
  5. Step 5: Solve for x
    x = 571,718.98/970
  6. Step 6: Final answer
    x = 589.40

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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.