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Finding the Fourth Proportional to 1,018.32, 1,405.08 and 625.50

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Solution

The fourth proportional to 1,018.32, 1,405.08 and 625.50 is: 863.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.32 : 1,405.08 = 625.50 : x
  2. Step 2: Convert to fraction form
    1,018.32/1,405.08 = 625.50/x
  3. Step 3: Cross multiply
    1,018.32x = 1,405.08 × 625.50
  4. Step 4: Simplify right side
    1,018.32x = 878,877.54
  5. Step 5: Solve for x
    x = 878,877.54/1,018.32
  6. Step 6: Final answer
    x = 863.07

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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.