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Finding the Fourth Proportional to 290,421.40, 435,632.10 and 172,031.80

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Solution

The fourth proportional to 290,421.40, 435,632.10 and 172,031.80 is: 258,047.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,421.40 : 435,632.10 = 172,031.80 : x
  2. Step 2: Convert to fraction form
    290,421.40/435,632.10 = 172,031.80/x
  3. Step 3: Cross multiply
    290,421.40x = 435,632.10 × 172,031.80
  4. Step 4: Simplify right side
    290,421.40x = 74,942,574,300.78
  5. Step 5: Solve for x
    x = 74,942,574,300.78/290,421.40
  6. Step 6: Final answer
    x = 258,047.70

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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.