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Finding the Fourth Proportional to 520,021.90, 780,032.85 and 455,740.30

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Solution

The fourth proportional to 520,021.90, 780,032.85 and 455,740.30 is: 683,610.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,021.90 : 780,032.85 = 455,740.30 : x
  2. Step 2: Convert to fraction form
    520,021.90/780,032.85 = 455,740.30/x
  3. Step 3: Cross multiply
    520,021.90x = 780,032.85 × 455,740.30
  4. Step 4: Simplify right side
    520,021.90x = 355,492,405,068.86
  5. Step 5: Solve for x
    x = 355,492,405,068.86/520,021.90
  6. Step 6: Final answer
    x = 683,610.45

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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.