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Finding the Fourth Proportional to 612,074.10, 918,111.15 and 328,638.90

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Solution

The fourth proportional to 612,074.10, 918,111.15 and 328,638.90 is: 492,958.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,074.10 : 918,111.15 = 328,638.90 : x
  2. Step 2: Convert to fraction form
    612,074.10/918,111.15 = 328,638.90/x
  3. Step 3: Cross multiply
    612,074.10x = 918,111.15 × 328,638.90
  4. Step 4: Simplify right side
    612,074.10x = 301,727,038,413.74
  5. Step 5: Solve for x
    x = 301,727,038,413.74/612,074.10
  6. Step 6: Final answer
    x = 492,958.35

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Double scale
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Similar ratio
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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.