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Finding the Fourth Proportional to 645,740.80, 891,122.32 and 359,260.80

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Solution

The fourth proportional to 645,740.80, 891,122.32 and 359,260.80 is: 495,779.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,740.80 : 891,122.32 = 359,260.80 : x
  2. Step 2: Convert to fraction form
    645,740.80/891,122.32 = 359,260.80/x
  3. Step 3: Cross multiply
    645,740.80x = 891,122.32 × 359,260.80
  4. Step 4: Simplify right side
    645,740.80x = 320,145,317,581.06
  5. Step 5: Solve for x
    x = 320,145,317,581.06/645,740.80
  6. Step 6: Final answer
    x = 495,779.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.