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Finding the Fourth Proportional to 2,087.40, 3,130.65 and 917.40

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Solution

The fourth proportional to 2,087.40, 3,130.65 and 917.40 is: 1,375.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,087.40 : 3,130.65 = 917.40 : x
  2. Step 2: Convert to fraction form
    2,087.40/3,130.65 = 917.40/x
  3. Step 3: Cross multiply
    2,087.40x = 3,130.65 × 917.40
  4. Step 4: Simplify right side
    2,087.40x = 2,872,058.31
  5. Step 5: Solve for x
    x = 2,872,058.31/2,087.40
  6. Step 6: Final answer
    x = 1,375.90

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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.