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Finding the Fourth Proportional to 951.40, 1,313.75 and 619.70

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Solution

The fourth proportional to 951.40, 1,313.75 and 619.70 is: 855.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.40 : 1,313.75 = 619.70 : x
  2. Step 2: Convert to fraction form
    951.40/1,313.75 = 619.70/x
  3. Step 3: Cross multiply
    951.40x = 1,313.75 × 619.70
  4. Step 4: Simplify right side
    951.40x = 814,130.88
  5. Step 5: Solve for x
    x = 814,130.88/951.40
  6. Step 6: Final answer
    x = 855.72

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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.