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Finding the Fourth Proportional to 528,870.40, 792,139.20 and 318,140.80

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Solution

The fourth proportional to 528,870.40, 792,139.20 and 318,140.80 is: 476,509.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,870.40 : 792,139.20 = 318,140.80 : x
  2. Step 2: Convert to fraction form
    528,870.40/792,139.20 = 318,140.80/x
  3. Step 3: Cross multiply
    528,870.40x = 792,139.20 × 318,140.80
  4. Step 4: Simplify right side
    528,870.40x = 252,011,798,799.36
  5. Step 5: Solve for x
    x = 252,011,798,799.36/528,870.40
  6. Step 6: Final answer
    x = 476,509.55

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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.