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Finding the Fourth Proportional to 972.28, 1,339.40 and 803.53

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Solution

The fourth proportional to 972.28, 1,339.40 and 803.53 is: 1,106.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.28 : 1,339.40 = 803.53 : x
  2. Step 2: Convert to fraction form
    972.28/1,339.40 = 803.53/x
  3. Step 3: Cross multiply
    972.28x = 1,339.40 × 803.53
  4. Step 4: Simplify right side
    972.28x = 1,076,248.08
  5. Step 5: Solve for x
    x = 1,076,248.08/972.28
  6. Step 6: Final answer
    x = 1,106.93

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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.