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Finding the Fourth Proportional to 163,543.70, 245,315.55 and 128,114.30

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Solution

The fourth proportional to 163,543.70, 245,315.55 and 128,114.30 is: 192,171.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    163,543.70 : 245,315.55 = 128,114.30 : x
  2. Step 2: Convert to fraction form
    163,543.70/245,315.55 = 128,114.30/x
  3. Step 3: Cross multiply
    163,543.70x = 245,315.55 × 128,114.30
  4. Step 4: Simplify right side
    163,543.70x = 31,428,429,967.37
  5. Step 5: Solve for x
    x = 31,428,429,967.37/163,543.70
  6. Step 6: Final answer
    x = 192,171.45

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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.