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Finding the Fourth Proportional to 260,019.80, 390,029.70 and 126,985.40

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Solution

The fourth proportional to 260,019.80, 390,029.70 and 126,985.40 is: 190,478.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,019.80 : 390,029.70 = 126,985.40 : x
  2. Step 2: Convert to fraction form
    260,019.80/390,029.70 = 126,985.40/x
  3. Step 3: Cross multiply
    260,019.80x = 390,029.70 × 126,985.40
  4. Step 4: Simplify right side
    260,019.80x = 49,528,077,466.38
  5. Step 5: Solve for x
    x = 49,528,077,466.38/260,019.80
  6. Step 6: Final answer
    x = 190,478.10

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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.