Home / 1,528.78-2,109.51-890.55

Finding the Fourth Proportional to 1,528.78, 2,109.51 and 890.55

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Solution

The fourth proportional to 1,528.78, 2,109.51 and 890.55 is: 1,228.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,528.78 : 2,109.51 = 890.55 : x
  2. Step 2: Convert to fraction form
    1,528.78/2,109.51 = 890.55/x
  3. Step 3: Cross multiply
    1,528.78x = 2,109.51 × 890.55
  4. Step 4: Simplify right side
    1,528.78x = 1,878,624.13
  5. Step 5: Solve for x
    x = 1,878,624.13/1,528.78
  6. Step 6: Final answer
    x = 1,228.84

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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.