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Finding the Fourth Proportional to 1,220.50, 1,681.32 and 925.48

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Solution

The fourth proportional to 1,220.50, 1,681.32 and 925.48 is: 1,274.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.50 : 1,681.32 = 925.48 : x
  2. Step 2: Convert to fraction form
    1,220.50/1,681.32 = 925.48/x
  3. Step 3: Cross multiply
    1,220.50x = 1,681.32 × 925.48
  4. Step 4: Simplify right side
    1,220.50x = 1,556,028.03
  5. Step 5: Solve for x
    x = 1,556,028.03/1,220.50
  6. Step 6: Final answer
    x = 1,274.91

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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.