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Finding the Fourth Proportional to 1,258.61, 1,887.91 and 436.88

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Solution

The fourth proportional to 1,258.61, 1,887.91 and 436.88 is: 655.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.61 : 1,887.91 = 436.88 : x
  2. Step 2: Convert to fraction form
    1,258.61/1,887.91 = 436.88/x
  3. Step 3: Cross multiply
    1,258.61x = 1,887.91 × 436.88
  4. Step 4: Simplify right side
    1,258.61x = 824,790.12
  5. Step 5: Solve for x
    x = 824,790.12/1,258.61
  6. Step 6: Final answer
    x = 655.32

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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.