Finding the Fourth Proportional to 638,831,313.70, 958,246,970.55 and 409,248,801.70
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Solution
The fourth proportional to 638,831,313.70, 958,246,970.55 and 409,248,801.70 is: 613,873,202.55
Step by Step Solution
- Step 1: Write the proportion equation
638,831,313.70 : 958,246,970.55 = 409,248,801.70 : x - Step 2: Convert to fraction form
638,831,313.70/958,246,970.55 = 409,248,801.70/x - Step 3: Cross multiply
638,831,313.70x = 958,246,970.55 × 409,248,801.70 - Step 4: Simplify right side
638,831,313.70x = 392,161,424,430,242,688 - Step 5: Solve for x
x = 392,161,424,430,242,688/638,831,313.70 - Step 6: Final answer
x = 613,873,202.55
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Double scale
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Similar ratio
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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.