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Finding the Fourth Proportional to 1,207.35, 1,665.54 and 787.19

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Solution

The fourth proportional to 1,207.35, 1,665.54 and 787.19 is: 1,085.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,207.35 : 1,665.54 = 787.19 : x
  2. Step 2: Convert to fraction form
    1,207.35/1,665.54 = 787.19/x
  3. Step 3: Cross multiply
    1,207.35x = 1,665.54 × 787.19
  4. Step 4: Simplify right side
    1,207.35x = 1,311,088.10
  5. Step 5: Solve for x
    x = 1,311,088.10/1,207.35
  6. Step 6: Final answer
    x = 1,085.92

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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.