Home / 1,405.10-2,108.40-528.20

Finding the Fourth Proportional to 1,405.10, 2,108.40 and 528.20

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Solution

The fourth proportional to 1,405.10, 2,108.40 and 528.20 is: 792.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.10 : 2,108.40 = 528.20 : x
  2. Step 2: Convert to fraction form
    1,405.10/2,108.40 = 528.20/x
  3. Step 3: Cross multiply
    1,405.10x = 2,108.40 × 528.20
  4. Step 4: Simplify right side
    1,405.10x = 1,113,646.34
  5. Step 5: Solve for x
    x = 1,113,646.34/1,405.10
  6. Step 6: Final answer
    x = 792.58

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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.