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Finding the Fourth Proportional to 1,187.15, 1,638.32 and 656.10

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Solution

The fourth proportional to 1,187.15, 1,638.32 and 656.10 is: 905.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.15 : 1,638.32 = 656.10 : x
  2. Step 2: Convert to fraction form
    1,187.15/1,638.32 = 656.10/x
  3. Step 3: Cross multiply
    1,187.15x = 1,638.32 × 656.10
  4. Step 4: Simplify right side
    1,187.15x = 1,074,901.75
  5. Step 5: Solve for x
    x = 1,074,901.75/1,187.15
  6. Step 6: Final answer
    x = 905.45

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1.5x scale

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.