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Finding the Fourth Proportional to 620,390.80, 869,728.10 and 620,390.80

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Solution

The fourth proportional to 620,390.80, 869,728.10 and 620,390.80 is: 869,728.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,390.80 : 869,728.10 = 620,390.80 : x
  2. Step 2: Convert to fraction form
    620,390.80/869,728.10 = 620,390.80/x
  3. Step 3: Cross multiply
    620,390.80x = 869,728.10 × 620,390.80
  4. Step 4: Simplify right side
    620,390.80x = 539,571,311,741.48
  5. Step 5: Solve for x
    x = 539,571,311,741.48/620,390.80
  6. Step 6: Final answer
    x = 869,728.10

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Double scale
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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.