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Finding the Fourth Proportional to 520,021.80, 780,032.70 and 319,692.60

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Solution

The fourth proportional to 520,021.80, 780,032.70 and 319,692.60 is: 479,538.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,021.80 : 780,032.70 = 319,692.60 : x
  2. Step 2: Convert to fraction form
    520,021.80/780,032.70 = 319,692.60/x
  3. Step 3: Cross multiply
    520,021.80x = 780,032.70 × 319,692.60
  4. Step 4: Simplify right side
    520,021.80x = 249,370,681,948.02
  5. Step 5: Solve for x
    x = 249,370,681,948.02/520,021.80
  6. Step 6: Final answer
    x = 479,538.90

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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.