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Finding the Fourth Proportional to 581,642.40, 872,002.80 and 318,986.40

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Solution

The fourth proportional to 581,642.40, 872,002.80 and 318,986.40 is: 478,226.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    581,642.40 : 872,002.80 = 318,986.40 : x
  2. Step 2: Convert to fraction form
    581,642.40/872,002.80 = 318,986.40/x
  3. Step 3: Cross multiply
    581,642.40x = 872,002.80 × 318,986.40
  4. Step 4: Simplify right side
    581,642.40x = 278,157,033,961.92
  5. Step 5: Solve for x
    x = 278,157,033,961.92/581,642.40
  6. Step 6: Final answer
    x = 478,226.89

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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.