Home / 1,528.45-2,108.91-931.25

Finding the Fourth Proportional to 1,528.45, 2,108.91 and 931.25

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Solution

The fourth proportional to 1,528.45, 2,108.91 and 931.25 is: 1,284.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.45 : 2,108.91 = 931.25 : x
  2. Step 2: Convert to fraction form
    1,528.45/2,108.91 = 931.25/x
  3. Step 3: Cross multiply
    1,528.45x = 2,108.91 × 931.25
  4. Step 4: Simplify right side
    1,528.45x = 1,963,931.20
  5. Step 5: Solve for x
    x = 1,963,931.20/1,528.45
  6. Step 6: Final answer
    x = 1,284.92

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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.