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Finding the Fourth Proportional to 620,165.40, 930,248.10 and 431,208.60

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Solution

The fourth proportional to 620,165.40, 930,248.10 and 431,208.60 is: 646,812.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,165.40 : 930,248.10 = 431,208.60 : x
  2. Step 2: Convert to fraction form
    620,165.40/930,248.10 = 431,208.60/x
  3. Step 3: Cross multiply
    620,165.40x = 930,248.10 × 431,208.60
  4. Step 4: Simplify right side
    620,165.40x = 401,130,980,853.66
  5. Step 5: Solve for x
    x = 401,130,980,853.66/620,165.40
  6. Step 6: Final answer
    x = 646,812.90

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Similar ratio
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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.