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Finding the Fourth Proportional to 620,385.80, 869,721.10 and 620,385.80

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Solution

The fourth proportional to 620,385.80, 869,721.10 and 620,385.80 is: 869,721.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,385.80 : 869,721.10 = 620,385.80 : x
  2. Step 2: Convert to fraction form
    620,385.80/869,721.10 = 620,385.80/x
  3. Step 3: Cross multiply
    620,385.80x = 869,721.10 × 620,385.80
  4. Step 4: Simplify right side
    620,385.80x = 539,562,620,400.38
  5. Step 5: Solve for x
    x = 539,562,620,400.38/620,385.80
  6. Step 6: Final answer
    x = 869,721.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.