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Finding the Fourth Proportional to 145,407.98, 217,955.10 and 70,369.58

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Solution

The fourth proportional to 145,407.98, 217,955.10 and 70,369.58 is: 105,478.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,407.98 : 217,955.10 = 70,369.58 : x
  2. Step 2: Convert to fraction form
    145,407.98/217,955.10 = 70,369.58/x
  3. Step 3: Cross multiply
    145,407.98x = 217,955.10 × 70,369.58
  4. Step 4: Simplify right side
    145,407.98x = 15,337,408,845.86
  5. Step 5: Solve for x
    x = 15,337,408,845.86/145,407.98
  6. Step 6: Final answer
    x = 105,478.45

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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.