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Finding the Fourth Proportional to 212,058.81, 318,049.34 and 85,666.01

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Solution

The fourth proportional to 212,058.81, 318,049.34 and 85,666.01 is: 128,483.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,058.81 : 318,049.34 = 85,666.01 : x
  2. Step 2: Convert to fraction form
    212,058.81/318,049.34 = 85,666.01/x
  3. Step 3: Cross multiply
    212,058.81x = 318,049.34 × 85,666.01
  4. Step 4: Simplify right side
    212,058.81x = 27,246,015,922.36
  5. Step 5: Solve for x
    x = 27,246,015,922.36/212,058.81
  6. Step 6: Final answer
    x = 128,483.30

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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.