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Finding the Fourth Proportional to 1,345.14, 1,856.70 and 847.76

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Solution

The fourth proportional to 1,345.14, 1,856.70 and 847.76 is: 1,170.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,345.14 : 1,856.70 = 847.76 : x
  2. Step 2: Convert to fraction form
    1,345.14/1,856.70 = 847.76/x
  3. Step 3: Cross multiply
    1,345.14x = 1,856.70 × 847.76
  4. Step 4: Simplify right side
    1,345.14x = 1,574,026.71
  5. Step 5: Solve for x
    x = 1,574,026.71/1,345.14
  6. Step 6: Final answer
    x = 1,170.16

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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.