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Finding the Fourth Proportional to 1,145.28, 1,580.58 and 703.20

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Solution

The fourth proportional to 1,145.28, 1,580.58 and 703.20 is: 970.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.28 : 1,580.58 = 703.20 : x
  2. Step 2: Convert to fraction form
    1,145.28/1,580.58 = 703.20/x
  3. Step 3: Cross multiply
    1,145.28x = 1,580.58 × 703.20
  4. Step 4: Simplify right side
    1,145.28x = 1,111,463.86
  5. Step 5: Solve for x
    x = 1,111,463.86/1,145.28
  6. Step 6: Final answer
    x = 970.47

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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.