Home / 1,287,480.80-1,931,211.60-388,920.80

Finding the Fourth Proportional to 1,287,480.80, 1,931,211.60 and 388,920.80

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Solution

The fourth proportional to 1,287,480.80, 1,931,211.60 and 388,920.80 is: 583,378.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,480.80 : 1,931,211.60 = 388,920.80 : x
  2. Step 2: Convert to fraction form
    1,287,480.80/1,931,211.60 = 388,920.80/x
  3. Step 3: Cross multiply
    1,287,480.80x = 1,931,211.60 × 388,920.80
  4. Step 4: Simplify right side
    1,287,480.80x = 751,088,360,441.28
  5. Step 5: Solve for x
    x = 751,088,360,441.28/1,287,480.80
  6. Step 6: Final answer
    x = 583,378.30

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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.