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Finding the Fourth Proportional to 520,020.90, 780,031.35 and 455,739.30

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Solution

The fourth proportional to 520,020.90, 780,031.35 and 455,739.30 is: 683,608.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,020.90 : 780,031.35 = 455,739.30 : x
  2. Step 2: Convert to fraction form
    520,020.90/780,031.35 = 455,739.30/x
  3. Step 3: Cross multiply
    520,020.90x = 780,031.35 × 455,739.30
  4. Step 4: Simplify right side
    520,020.90x = 355,490,941,427.06
  5. Step 5: Solve for x
    x = 355,490,941,427.06/520,020.90
  6. Step 6: Final answer
    x = 683,608.95

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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.