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Finding the Fourth Proportional to 315,459.40, 473,016.30 and 128,259.40

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Solution

The fourth proportional to 315,459.40, 473,016.30 and 128,259.40 is: 192,318.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,459.40 : 473,016.30 = 128,259.40 : x
  2. Step 2: Convert to fraction form
    315,459.40/473,016.30 = 128,259.40/x
  3. Step 3: Cross multiply
    315,459.40x = 473,016.30 × 128,259.40
  4. Step 4: Simplify right side
    315,459.40x = 60,668,786,828.22
  5. Step 5: Solve for x
    x = 60,668,786,828.22/315,459.40
  6. Step 6: Final answer
    x = 192,318.84

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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.