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Finding the Fourth Proportional to 875.70, 1,310.85 and 509.40

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Solution

The fourth proportional to 875.70, 1,310.85 and 509.40 is: 762.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.70 : 1,310.85 = 509.40 : x
  2. Step 2: Convert to fraction form
    875.70/1,310.85 = 509.40/x
  3. Step 3: Cross multiply
    875.70x = 1,310.85 × 509.40
  4. Step 4: Simplify right side
    875.70x = 667,746.99
  5. Step 5: Solve for x
    x = 667,746.99/875.70
  6. Step 6: Final answer
    x = 762.53

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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.