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Finding the Fourth Proportional to 420,331.34, 630,502.47 and 139,848.59

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Solution

The fourth proportional to 420,331.34, 630,502.47 and 139,848.59 is: 209,774.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,331.34 : 630,502.47 = 139,848.59 : x
  2. Step 2: Convert to fraction form
    420,331.34/630,502.47 = 139,848.59/x
  3. Step 3: Cross multiply
    420,331.34x = 630,502.47 × 139,848.59
  4. Step 4: Simplify right side
    420,331.34x = 88,174,878,268.51
  5. Step 5: Solve for x
    x = 88,174,878,268.51/420,331.34
  6. Step 6: Final answer
    x = 209,774.70

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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.