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Finding the Fourth Proportional to 253,130.40, 349,307.10 and 139,931.28

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Solution

The fourth proportional to 253,130.40, 349,307.10 and 139,931.28 is: 193,098.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    253,130.40 : 349,307.10 = 139,931.28 : x
  2. Step 2: Convert to fraction form
    253,130.40/349,307.10 = 139,931.28/x
  3. Step 3: Cross multiply
    253,130.40x = 349,307.10 × 139,931.28
  4. Step 4: Simplify right side
    253,130.40x = 48,878,989,616.09
  5. Step 5: Solve for x
    x = 48,878,989,616.09/253,130.40
  6. Step 6: Final answer
    x = 193,098.06

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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.