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Finding the Fourth Proportional to 707.28, 1,055.72 and 656.56

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Solution

The fourth proportional to 707.28, 1,055.72 and 656.56 is: 980.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.28 : 1,055.72 = 656.56 : x
  2. Step 2: Convert to fraction form
    707.28/1,055.72 = 656.56/x
  3. Step 3: Cross multiply
    707.28x = 1,055.72 × 656.56
  4. Step 4: Simplify right side
    707.28x = 693,143.52
  5. Step 5: Solve for x
    x = 693,143.52/707.28
  6. Step 6: Final answer
    x = 980.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.