Home / 5,187-7,780.50-1,291.40

Finding the Fourth Proportional to 5,187, 7,780.50 and 1,291.40

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Solution

The fourth proportional to 5,187, 7,780.50 and 1,291.40 is: 1,937.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,187 : 7,780.50 = 1,291.40 : x
  2. Step 2: Convert to fraction form
    5,187/7,780.50 = 1,291.40/x
  3. Step 3: Cross multiply
    5,187x = 7,780.50 × 1,291.40
  4. Step 4: Simplify right side
    5,187x = 10,047,737.70
  5. Step 5: Solve for x
    x = 10,047,737.70/5,187
  6. Step 6: Final answer
    x = 1,937.10

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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.