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Finding the Fourth Proportional to 1,018.43, 1,406.58 and 688.22

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Solution

The fourth proportional to 1,018.43, 1,406.58 and 688.22 is: 950.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.43 : 1,406.58 = 688.22 : x
  2. Step 2: Convert to fraction form
    1,018.43/1,406.58 = 688.22/x
  3. Step 3: Cross multiply
    1,018.43x = 1,406.58 × 688.22
  4. Step 4: Simplify right side
    1,018.43x = 968,036.49
  5. Step 5: Solve for x
    x = 968,036.49/1,018.43
  6. Step 6: Final answer
    x = 950.52

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1.5x scale

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.