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Finding the Fourth Proportional to 1,510.40, 2,265.72 and 688.70

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Solution

The fourth proportional to 1,510.40, 2,265.72 and 688.70 is: 1,033.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,510.40 : 2,265.72 = 688.70 : x
  2. Step 2: Convert to fraction form
    1,510.40/2,265.72 = 688.70/x
  3. Step 3: Cross multiply
    1,510.40x = 2,265.72 × 688.70
  4. Step 4: Simplify right side
    1,510.40x = 1,560,401.36
  5. Step 5: Solve for x
    x = 1,560,401.36/1,510.40
  6. Step 6: Final answer
    x = 1,033.10

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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.