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Finding the Fourth Proportional to 1,019.43, 1,406.25 and 688.32

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Solution

The fourth proportional to 1,019.43, 1,406.25 and 688.32 is: 949.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.43 : 1,406.25 = 688.32 : x
  2. Step 2: Convert to fraction form
    1,019.43/1,406.25 = 688.32/x
  3. Step 3: Cross multiply
    1,019.43x = 1,406.25 × 688.32
  4. Step 4: Simplify right side
    1,019.43x = 967,950.00
  5. Step 5: Solve for x
    x = 967,950.00/1,019.43
  6. Step 6: Final answer
    x = 949.50

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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.