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Finding the Fourth Proportional to 620,690.80, 931,036.20 and 305,762.80

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Solution

The fourth proportional to 620,690.80, 931,036.20 and 305,762.80 is: 458,644.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,690.80 : 931,036.20 = 305,762.80 : x
  2. Step 2: Convert to fraction form
    620,690.80/931,036.20 = 305,762.80/x
  3. Step 3: Cross multiply
    620,690.80x = 931,036.20 × 305,762.80
  4. Step 4: Simplify right side
    620,690.80x = 284,676,235,413.36
  5. Step 5: Solve for x
    x = 284,676,235,413.36/620,690.80
  6. Step 6: Final answer
    x = 458,644.20

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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.