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Finding the Fourth Proportional to 1,031.45, 1,423.76 and 617.45

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Solution

The fourth proportional to 1,031.45, 1,423.76 and 617.45 is: 852.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,031.45 : 1,423.76 = 617.45 : x
  2. Step 2: Convert to fraction form
    1,031.45/1,423.76 = 617.45/x
  3. Step 3: Cross multiply
    1,031.45x = 1,423.76 × 617.45
  4. Step 4: Simplify right side
    1,031.45x = 879,090.41
  5. Step 5: Solve for x
    x = 879,090.41/1,031.45
  6. Step 6: Final answer
    x = 852.29

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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.