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Finding the Fourth Proportional to 520,897.80, 780,180.30 and 427,585.80

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Solution

The fourth proportional to 520,897.80, 780,180.30 and 427,585.80 is: 640,421.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,897.80 : 780,180.30 = 427,585.80 : x
  2. Step 2: Convert to fraction form
    520,897.80/780,180.30 = 427,585.80/x
  3. Step 3: Cross multiply
    520,897.80x = 780,180.30 × 427,585.80
  4. Step 4: Simplify right side
    520,897.80x = 333,594,017,719.74
  5. Step 5: Solve for x
    x = 333,594,017,719.74/520,897.80
  6. Step 6: Final answer
    x = 640,421.25

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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.