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Finding the Fourth Proportional to 153,458.79, 211,805.81 and 103,128.63

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Solution

The fourth proportional to 153,458.79, 211,805.81 and 103,128.63 is: 142,339.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,458.79 : 211,805.81 = 103,128.63 : x
  2. Step 2: Convert to fraction form
    153,458.79/211,805.81 = 103,128.63/x
  3. Step 3: Cross multiply
    153,458.79x = 211,805.81 × 103,128.63
  4. Step 4: Simplify right side
    153,458.79x = 21,843,243,011.34
  5. Step 5: Solve for x
    x = 21,843,243,011.34/153,458.79
  6. Step 6: Final answer
    x = 142,339.47

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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.