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Finding the Fourth Proportional to 620,689.80, 931,034.70 and 442,230.60

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Solution

The fourth proportional to 620,689.80, 931,034.70 and 442,230.60 is: 663,345.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,689.80 : 931,034.70 = 442,230.60 : x
  2. Step 2: Convert to fraction form
    620,689.80/931,034.70 = 442,230.60/x
  3. Step 3: Cross multiply
    620,689.80x = 931,034.70 × 442,230.60
  4. Step 4: Simplify right side
    620,689.80x = 411,732,034,001.82
  5. Step 5: Solve for x
    x = 411,732,034,001.82/620,689.80
  6. Step 6: Final answer
    x = 663,345.90

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Double scale
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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.