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Finding the Fourth Proportional to 145,315.80, 218,009.70 and 66,413.40

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Solution

The fourth proportional to 145,315.80, 218,009.70 and 66,413.40 is: 99,636.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,315.80 : 218,009.70 = 66,413.40 : x
  2. Step 2: Convert to fraction form
    145,315.80/218,009.70 = 66,413.40/x
  3. Step 3: Cross multiply
    145,315.80x = 218,009.70 × 66,413.40
  4. Step 4: Simplify right side
    145,315.80x = 14,478,765,409.98
  5. Step 5: Solve for x
    x = 14,478,765,409.98/145,315.80
  6. Step 6: Final answer
    x = 99,636.55

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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.