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Finding the Fourth Proportional to 879,854.40, 1,319,781.60 and 280,859.40

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Solution

The fourth proportional to 879,854.40, 1,319,781.60 and 280,859.40 is: 421,289.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,854.40 : 1,319,781.60 = 280,859.40 : x
  2. Step 2: Convert to fraction form
    879,854.40/1,319,781.60 = 280,859.40/x
  3. Step 3: Cross multiply
    879,854.40x = 1,319,781.60 × 280,859.40
  4. Step 4: Simplify right side
    879,854.40x = 370,673,068,307.04
  5. Step 5: Solve for x
    x = 370,673,068,307.04/879,854.40
  6. Step 6: Final answer
    x = 421,289.10

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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.