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Finding the Fourth Proportional to 1,258.16, 1,885.80 and 488

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Solution

The fourth proportional to 1,258.16, 1,885.80 and 488 is: 731.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.16 : 1,885.80 = 488 : x
  2. Step 2: Convert to fraction form
    1,258.16/1,885.80 = 488/x
  3. Step 3: Cross multiply
    1,258.16x = 1,885.80 × 488
  4. Step 4: Simplify right side
    1,258.16x = 920,270.40
  5. Step 5: Solve for x
    x = 920,270.40/1,258.16
  6. Step 6: Final answer
    x = 731.44

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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.