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Finding the Fourth Proportional to 525,986.80, 788,980.20 and 485,436.40

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Solution

The fourth proportional to 525,986.80, 788,980.20 and 485,436.40 is: 728,154.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    525,986.80 : 788,980.20 = 485,436.40 : x
  2. Step 2: Convert to fraction form
    525,986.80/788,980.20 = 485,436.40/x
  3. Step 3: Cross multiply
    525,986.80x = 788,980.20 × 485,436.40
  4. Step 4: Simplify right side
    525,986.80x = 382,999,707,959.28
  5. Step 5: Solve for x
    x = 382,999,707,959.28/525,986.80
  6. Step 6: Final answer
    x = 728,154.60

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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.