Home / 520,931.28-780,385.80-383,905.50

Finding the Fourth Proportional to 520,931.28, 780,385.80 and 383,905.50

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Solution

The fourth proportional to 520,931.28, 780,385.80 and 383,905.50 is: 575,113.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,931.28 : 780,385.80 = 383,905.50 : x
  2. Step 2: Convert to fraction form
    520,931.28/780,385.80 = 383,905.50/x
  3. Step 3: Cross multiply
    520,931.28x = 780,385.80 × 383,905.50
  4. Step 4: Simplify right side
    520,931.28x = 299,594,400,741.90
  5. Step 5: Solve for x
    x = 299,594,400,741.90/520,931.28
  6. Step 6: Final answer
    x = 575,113.10

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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.