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Finding the Fourth Proportional to 1,018.75, 1,405.88 and 670.06

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Solution

The fourth proportional to 1,018.75, 1,405.88 and 670.06 is: 924.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.75 : 1,405.88 = 670.06 : x
  2. Step 2: Convert to fraction form
    1,018.75/1,405.88 = 670.06/x
  3. Step 3: Cross multiply
    1,018.75x = 1,405.88 × 670.06
  4. Step 4: Simplify right side
    1,018.75x = 942,020.60
  5. Step 5: Solve for x
    x = 942,020.60/1,018.75
  6. Step 6: Final answer
    x = 924.68

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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.