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Finding the Fourth Proportional to 970.27, 1,455.80 and 393.55

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Solution

The fourth proportional to 970.27, 1,455.80 and 393.55 is: 590.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.27 : 1,455.80 = 393.55 : x
  2. Step 2: Convert to fraction form
    970.27/1,455.80 = 393.55/x
  3. Step 3: Cross multiply
    970.27x = 1,455.80 × 393.55
  4. Step 4: Simplify right side
    970.27x = 572,930.09
  5. Step 5: Solve for x
    x = 572,930.09/970.27
  6. Step 6: Final answer
    x = 590.49

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1.5x scale

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.