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Finding the Fourth Proportional to 1.07, 1.47 and 0.87

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Solution

The fourth proportional to 1.07, 1.47 and 0.87 is: 1.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1.07 : 1.47 = 0.87 : x
  2. Step 2: Convert to fraction form
    1.07/1.47 = 0.87/x
  3. Step 3: Cross multiply
    1.07x = 1.47 × 0.87
  4. Step 4: Simplify right side
    1.07x = 1.27
  5. Step 5: Solve for x
    x = 1.27/1.07
  6. Step 6: Final answer
    x = 1.19

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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.