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Finding the Fourth Proportional to 1,071.60, 1,607.40 and 856.55

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Solution

The fourth proportional to 1,071.60, 1,607.40 and 856.55 is: 1,284.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.60 : 1,607.40 = 856.55 : x
  2. Step 2: Convert to fraction form
    1,071.60/1,607.40 = 856.55/x
  3. Step 3: Cross multiply
    1,071.60x = 1,607.40 × 856.55
  4. Step 4: Simplify right side
    1,071.60x = 1,376,810.43
  5. Step 5: Solve for x
    x = 1,376,810.43/1,071.60
  6. Step 6: Final answer
    x = 1,284.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.