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Finding the Fourth Proportional to 520,131.90, 778,885.65 and 415,155.90

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Solution

The fourth proportional to 520,131.90, 778,885.65 and 415,155.90 is: 621,686.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,131.90 : 778,885.65 = 415,155.90 : x
  2. Step 2: Convert to fraction form
    520,131.90/778,885.65 = 415,155.90/x
  3. Step 3: Cross multiply
    520,131.90x = 778,885.65 × 415,155.90
  4. Step 4: Simplify right side
    520,131.90x = 323,358,973,022.84
  5. Step 5: Solve for x
    x = 323,358,973,022.84/520,131.90
  6. Step 6: Final answer
    x = 621,686.49

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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.