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Finding the Fourth Proportional to 216,681.53, 299,018.79 and 121,188.15

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Solution

The fourth proportional to 216,681.53, 299,018.79 and 121,188.15 is: 167,238.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,681.53 : 299,018.79 = 121,188.15 : x
  2. Step 2: Convert to fraction form
    216,681.53/299,018.79 = 121,188.15/x
  3. Step 3: Cross multiply
    216,681.53x = 299,018.79 × 121,188.15
  4. Step 4: Simplify right side
    216,681.53x = 36,237,533,975.34
  5. Step 5: Solve for x
    x = 36,237,533,975.34/216,681.53
  6. Step 6: Final answer
    x = 167,238.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.