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Finding the Fourth Proportional to 260,047.40, 390,071.10 and 212,808.20

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Solution

The fourth proportional to 260,047.40, 390,071.10 and 212,808.20 is: 319,212.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,047.40 : 390,071.10 = 212,808.20 : x
  2. Step 2: Convert to fraction form
    260,047.40/390,071.10 = 212,808.20/x
  3. Step 3: Cross multiply
    260,047.40x = 390,071.10 × 212,808.20
  4. Step 4: Simplify right side
    260,047.40x = 83,010,328,663.02
  5. Step 5: Solve for x
    x = 83,010,328,663.02/260,047.40
  6. Step 6: Final answer
    x = 319,212.30

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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.