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Finding the Fourth Proportional to 1,018.50, 1,402.44 and 870.81

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Solution

The fourth proportional to 1,018.50, 1,402.44 and 870.81 is: 1,199.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.50 : 1,402.44 = 870.81 : x
  2. Step 2: Convert to fraction form
    1,018.50/1,402.44 = 870.81/x
  3. Step 3: Cross multiply
    1,018.50x = 1,402.44 × 870.81
  4. Step 4: Simplify right side
    1,018.50x = 1,221,258.78
  5. Step 5: Solve for x
    x = 1,221,258.78/1,018.50
  6. Step 6: Final answer
    x = 1,199.08

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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.