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Finding the Fourth Proportional to 1,312.16, 1,810.68 and 787.88

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Solution

The fourth proportional to 1,312.16, 1,810.68 and 787.88 is: 1,087.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.16 : 1,810.68 = 787.88 : x
  2. Step 2: Convert to fraction form
    1,312.16/1,810.68 = 787.88/x
  3. Step 3: Cross multiply
    1,312.16x = 1,810.68 × 787.88
  4. Step 4: Simplify right side
    1,312.16x = 1,426,598.56
  5. Step 5: Solve for x
    x = 1,426,598.56/1,312.16
  6. Step 6: Final answer
    x = 1,087.21

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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.