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Finding the Fourth Proportional to 256,820.45, 354,413.42 and 143,643.20

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Solution

The fourth proportional to 256,820.45, 354,413.42 and 143,643.20 is: 198,228.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,820.45 : 354,413.42 = 143,643.20 : x
  2. Step 2: Convert to fraction form
    256,820.45/354,413.42 = 143,643.20/x
  3. Step 3: Cross multiply
    256,820.45x = 354,413.42 × 143,643.20
  4. Step 4: Simplify right side
    256,820.45x = 50,909,075,281.46
  5. Step 5: Solve for x
    x = 50,909,075,281.46/256,820.45
  6. Step 6: Final answer
    x = 198,228.28

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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.