Home / 1,688.12-2,528.22-864.32

Finding the Fourth Proportional to 1,688.12, 2,528.22 and 864.32

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Solution

The fourth proportional to 1,688.12, 2,528.22 and 864.32 is: 1,294.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.12 : 2,528.22 = 864.32 : x
  2. Step 2: Convert to fraction form
    1,688.12/2,528.22 = 864.32/x
  3. Step 3: Cross multiply
    1,688.12x = 2,528.22 × 864.32
  4. Step 4: Simplify right side
    1,688.12x = 2,185,191.11
  5. Step 5: Solve for x
    x = 2,185,191.11/1,688.12
  6. Step 6: Final answer
    x = 1,294.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.