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Finding the Fourth Proportional to 1,312.61, 1,811.25 and 815.06

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Solution

The fourth proportional to 1,312.61, 1,811.25 and 815.06 is: 1,124.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.61 : 1,811.25 = 815.06 : x
  2. Step 2: Convert to fraction form
    1,312.61/1,811.25 = 815.06/x
  3. Step 3: Cross multiply
    1,312.61x = 1,811.25 × 815.06
  4. Step 4: Simplify right side
    1,312.61x = 1,476,277.43
  5. Step 5: Solve for x
    x = 1,476,277.43/1,312.61
  6. Step 6: Final answer
    x = 1,124.69

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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.