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Finding the Fourth Proportional to 208,441.40, 312,662.10 and 90,030.20

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Solution

The fourth proportional to 208,441.40, 312,662.10 and 90,030.20 is: 135,045.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,441.40 : 312,662.10 = 90,030.20 : x
  2. Step 2: Convert to fraction form
    208,441.40/312,662.10 = 90,030.20/x
  3. Step 3: Cross multiply
    208,441.40x = 312,662.10 × 90,030.20
  4. Step 4: Simplify right side
    208,441.40x = 28,149,031,395.42
  5. Step 5: Solve for x
    x = 28,149,031,395.42/208,441.40
  6. Step 6: Final answer
    x = 135,045.30

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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.