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Finding the Fourth Proportional to 620,078.20, 930,117.30 and 578,087.80

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Solution

The fourth proportional to 620,078.20, 930,117.30 and 578,087.80 is: 867,131.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,078.20 : 930,117.30 = 578,087.80 : x
  2. Step 2: Convert to fraction form
    620,078.20/930,117.30 = 578,087.80/x
  3. Step 3: Cross multiply
    620,078.20x = 930,117.30 × 578,087.80
  4. Step 4: Simplify right side
    620,078.20x = 537,689,463,698.94
  5. Step 5: Solve for x
    x = 537,689,463,698.94/620,078.20
  6. Step 6: Final answer
    x = 867,131.70

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Double scale
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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.