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Finding the Fourth Proportional to 1,312.21, 1,811.70 and 914.71

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Solution

The fourth proportional to 1,312.21, 1,811.70 and 914.71 is: 1,262.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.21 : 1,811.70 = 914.71 : x
  2. Step 2: Convert to fraction form
    1,312.21/1,811.70 = 914.71/x
  3. Step 3: Cross multiply
    1,312.21x = 1,811.70 × 914.71
  4. Step 4: Simplify right side
    1,312.21x = 1,657,180.11
  5. Step 5: Solve for x
    x = 1,657,180.11/1,312.21
  6. Step 6: Final answer
    x = 1,262.89

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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.