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Finding the Fourth Proportional to 153,478.89, 211,810.59 and 86,415.21

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Solution

The fourth proportional to 153,478.89, 211,810.59 and 86,415.21 is: 119,258.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,478.89 : 211,810.59 = 86,415.21 : x
  2. Step 2: Convert to fraction form
    153,478.89/211,810.59 = 86,415.21/x
  3. Step 3: Cross multiply
    153,478.89x = 211,810.59 × 86,415.21
  4. Step 4: Simplify right side
    153,478.89x = 18,303,656,615.07
  5. Step 5: Solve for x
    x = 18,303,656,615.07/153,478.89
  6. Step 6: Final answer
    x = 119,258.46

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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.