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Finding the Fourth Proportional to 213,040.80, 319,407.60 and 139,210.40

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Solution

The fourth proportional to 213,040.80, 319,407.60 and 139,210.40 is: 208,715.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,040.80 : 319,407.60 = 139,210.40 : x
  2. Step 2: Convert to fraction form
    213,040.80/319,407.60 = 139,210.40/x
  3. Step 3: Cross multiply
    213,040.80x = 319,407.60 × 139,210.40
  4. Step 4: Simplify right side
    213,040.80x = 44,464,859,759.04
  5. Step 5: Solve for x
    x = 44,464,859,759.04/213,040.80
  6. Step 6: Final answer
    x = 208,715.23

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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.