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Finding the Fourth Proportional to 1,312.17, 1,811.36 and 934.31

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Solution

The fourth proportional to 1,312.17, 1,811.36 and 934.31 is: 1,289.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.17 : 1,811.36 = 934.31 : x
  2. Step 2: Convert to fraction form
    1,312.17/1,811.36 = 934.31/x
  3. Step 3: Cross multiply
    1,312.17x = 1,811.36 × 934.31
  4. Step 4: Simplify right side
    1,312.17x = 1,692,371.76
  5. Step 5: Solve for x
    x = 1,692,371.76/1,312.17
  6. Step 6: Final answer
    x = 1,289.75

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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.