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Finding the Fourth Proportional to 1,527.64, 2,107.80 and 864.40

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Solution

The fourth proportional to 1,527.64, 2,107.80 and 864.40 is: 1,192.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,527.64 : 2,107.80 = 864.40 : x
  2. Step 2: Convert to fraction form
    1,527.64/2,107.80 = 864.40/x
  3. Step 3: Cross multiply
    1,527.64x = 2,107.80 × 864.40
  4. Step 4: Simplify right side
    1,527.64x = 1,821,982.32
  5. Step 5: Solve for x
    x = 1,821,982.32/1,527.64
  6. Step 6: Final answer
    x = 1,192.68

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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.