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Finding the Fourth Proportional to 970.47, 1,335.87 and 921.24

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Solution

The fourth proportional to 970.47, 1,335.87 and 921.24 is: 1,268.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.47 : 1,335.87 = 921.24 : x
  2. Step 2: Convert to fraction form
    970.47/1,335.87 = 921.24/x
  3. Step 3: Cross multiply
    970.47x = 1,335.87 × 921.24
  4. Step 4: Simplify right side
    970.47x = 1,230,656.88
  5. Step 5: Solve for x
    x = 1,230,656.88/970.47
  6. Step 6: Final answer
    x = 1,268.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.