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Finding the Fourth Proportional to 620,646.30, 930,969.45 and 221,300.10

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Solution

The fourth proportional to 620,646.30, 930,969.45 and 221,300.10 is: 331,950.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,646.30 : 930,969.45 = 221,300.10 : x
  2. Step 2: Convert to fraction form
    620,646.30/930,969.45 = 221,300.10/x
  3. Step 3: Cross multiply
    620,646.30x = 930,969.45 × 221,300.10
  4. Step 4: Simplify right side
    620,646.30x = 206,023,632,381.95
  5. Step 5: Solve for x
    x = 206,023,632,381.95/620,646.30
  6. Step 6: Final answer
    x = 331,950.15

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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.