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Finding the Fourth Proportional to 987.18, 1,360.59 and 655.01

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Solution

The fourth proportional to 987.18, 1,360.59 and 655.01 is: 902.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.18 : 1,360.59 = 655.01 : x
  2. Step 2: Convert to fraction form
    987.18/1,360.59 = 655.01/x
  3. Step 3: Cross multiply
    987.18x = 1,360.59 × 655.01
  4. Step 4: Simplify right side
    987.18x = 891,200.06
  5. Step 5: Solve for x
    x = 891,200.06/987.18
  6. Step 6: Final answer
    x = 902.77

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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.