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Finding the Fourth Proportional to 1,065.08, 1,588.23 and 991.12

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Solution

The fourth proportional to 1,065.08, 1,588.23 and 991.12 is: 1,477.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.08 : 1,588.23 = 991.12 : x
  2. Step 2: Convert to fraction form
    1,065.08/1,588.23 = 991.12/x
  3. Step 3: Cross multiply
    1,065.08x = 1,588.23 × 991.12
  4. Step 4: Simplify right side
    1,065.08x = 1,574,126.52
  5. Step 5: Solve for x
    x = 1,574,126.52/1,065.08
  6. Step 6: Final answer
    x = 1,477.94

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1.5x scale

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.