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Finding the Fourth Proportional to 970.68, 1,455.90 and 393.56

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Solution

The fourth proportional to 970.68, 1,455.90 and 393.56 is: 590.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.68 : 1,455.90 = 393.56 : x
  2. Step 2: Convert to fraction form
    970.68/1,455.90 = 393.56/x
  3. Step 3: Cross multiply
    970.68x = 1,455.90 × 393.56
  4. Step 4: Simplify right side
    970.68x = 572,984.00
  5. Step 5: Solve for x
    x = 572,984.00/970.68
  6. Step 6: Final answer
    x = 590.29

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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.