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Finding the Fourth Proportional to 1,117.93, 1,677.01 and 387.51

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Solution

The fourth proportional to 1,117.93, 1,677.01 and 387.51 is: 581.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.93 : 1,677.01 = 387.51 : x
  2. Step 2: Convert to fraction form
    1,117.93/1,677.01 = 387.51/x
  3. Step 3: Cross multiply
    1,117.93x = 1,677.01 × 387.51
  4. Step 4: Simplify right side
    1,117.93x = 649,849.76
  5. Step 5: Solve for x
    x = 649,849.76/1,117.93
  6. Step 6: Final answer
    x = 581.30

Related Problems

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.