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Finding the Fourth Proportional to 1,280.76, 1,921.74 and 631.14

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Solution

The fourth proportional to 1,280.76, 1,921.74 and 631.14 is: 947.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.76 : 1,921.74 = 631.14 : x
  2. Step 2: Convert to fraction form
    1,280.76/1,921.74 = 631.14/x
  3. Step 3: Cross multiply
    1,280.76x = 1,921.74 × 631.14
  4. Step 4: Simplify right side
    1,280.76x = 1,212,886.98
  5. Step 5: Solve for x
    x = 1,212,886.98/1,280.76
  6. Step 6: Final answer
    x = 947.01

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1.5x scale

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.