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Finding the Fourth Proportional to 1,311.52, 1,810.20 and 788.08

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Solution

The fourth proportional to 1,311.52, 1,810.20 and 788.08 is: 1,087.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.52 : 1,810.20 = 788.08 : x
  2. Step 2: Convert to fraction form
    1,311.52/1,810.20 = 788.08/x
  3. Step 3: Cross multiply
    1,311.52x = 1,810.20 × 788.08
  4. Step 4: Simplify right side
    1,311.52x = 1,426,582.42
  5. Step 5: Solve for x
    x = 1,426,582.42/1,311.52
  6. Step 6: Final answer
    x = 1,087.73

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1.5x scale

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.