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Finding the Fourth Proportional to 210,315.80, 314,955.30 and 139,813.40

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Solution

The fourth proportional to 210,315.80, 314,955.30 and 139,813.40 is: 209,375.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,315.80 : 314,955.30 = 139,813.40 : x
  2. Step 2: Convert to fraction form
    210,315.80/314,955.30 = 139,813.40/x
  3. Step 3: Cross multiply
    210,315.80x = 314,955.30 × 139,813.40
  4. Step 4: Simplify right side
    210,315.80x = 44,034,971,341.02
  5. Step 5: Solve for x
    x = 44,034,971,341.02/210,315.80
  6. Step 6: Final answer
    x = 209,375.48

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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.