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Finding the Fourth Proportional to 210,325.60, 315,488.40 and 85,666.60

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Solution

The fourth proportional to 210,325.60, 315,488.40 and 85,666.60 is: 128,499.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,325.60 : 315,488.40 = 85,666.60 : x
  2. Step 2: Convert to fraction form
    210,325.60/315,488.40 = 85,666.60/x
  3. Step 3: Cross multiply
    210,325.60x = 315,488.40 × 85,666.60
  4. Step 4: Simplify right side
    210,325.60x = 27,026,818,567.44
  5. Step 5: Solve for x
    x = 27,026,818,567.44/210,325.60
  6. Step 6: Final answer
    x = 128,499.90

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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.